Mechanical movement



(No Model.)

J. THOMSON.

I MECHANICAL MDVEMBNT.

N0. 331,846. Patented Dec. 8, 1885.

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UNITED STATES PATENT Oriana,

JOHN THOMSON, OF BROOKLYN, NEW YORK.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 331,846, dated December 8, 1885.

Application filed June 1, 1885. Serial No. 167,300.

To rtZZ whom it 77mg concern.-

Be it known that I, JOHN Tnonson, of Brooklyn, Kings county, and State of New York, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specification.

My invention consists in means for controlling and'insuring the true rolling action of a curved body upon a plane until the said body will have reached a predetermined position, and to then change the rolling action byadifferential rolling and sliding movement into a sliding motion only, and vice versa, and to effect both these movements from a reciprocating movement of a rod, bar, or lever connected to the said body. The character of the body and the extent of the rolling motion and of the sliding motion desired to be imparted thereto determine the particular form of my device.

In the drawings I have shown a construction adapted for use in presses of different kinds, Figure 1 being a side elevation sufficient to illustrate the construction and operation of my new movements, and Fig. 2 being a section on the line C, Fig. 1, looking in the direct-ion of the arrow 1.

The part A, to which the combined rocking and sliding movements are imparted, I term a block, and the other part, B, to and from which the block A is to be moved, I term a bed, the block A, in case the movement is used in a press, carrying a face-plate or platen, 3, which is to be brought parallel to the face 2 of the bed B, the latter in the construction shown being secured fixedly to the frame 0 of the apparatus, and the block A resting upon the face 6 of a horizontal table, D, secured to said frame.

It will be understood that while I have shown the bed D as occupying a fixed position it may be movable in the same manner as the block A, or otherwise, or the block may be used in some instanceswithout a bed.

The block A is provided with a curved face,

5, and the latter preferably merges into a'fiat face, 10, so that the block may slide upon the table D, with its fiat face in contact therewith, and also rock upon the said table upon its curved face 5. It is not essential, however, to have the curved face of the rocking block (No model.)

terminate in a flattened portion, as the entire lower face of the block which moves over and upon the face 6 of the table may be curved. The face 5 in the construction shown is curved to correspond to the arc of a circle, whose center at 9 is upon a line or plane extending through the axis of a trunnion, c, by which a reciprocating arm or lever, 4, is journaled to the side of the block A; but it is not essential in all instances that the face of the block shall correspond to a circle having its center as described, or'that it shall correspond to a regular curve, as .in some instances the curve may be parabolic or otherwise, where it is desired to impart a varying rocking motion to the block.

With the parts constructed as above described is also combined a guide-plate, E, secured to the block or forming a part thereof and moving therewith, extending downward past the edge of the table, and provided with true rolling action and the reciprocating slidv ing action of the block.

The particular form of the curved portion of the slot between the points 13 and la depends upon that of the curved face 5 of the block. Thus,when the said face 5 conforms to the arc of a circle having its center at the point 9, the curve of the slot as between 13 and 14 will be cycloidal, and corresponds to the path that would be traced by a point in the center of the stud 6 through the guideplatc E as the block A rocks upon the table I); but it will be apparent that this portion of the slotxwill be of adifferent form if the curved face of the block is cycloidal or elliptical, or of other than a form corresponding to a circle. The straight portion of the slot, when the block A is at the termination of its forward rocking movement,

is parallel with the plane in which the block is caused to slide, and, as shown, the connecting portion of the slot between the point 13 and 18 corresponds to the arc of a circle.

When the parts are in the position shown in Fig. 1, the forward movement of the arm 4 in the direction of its arrow 2 will cause the block A to slide forward with its face 10 in contact with the face of the table, the stud e and friction-roller 16, in connection with the straight portion of the slot, serving to guide the block, so that while it moves forward in a straight line it will have no rocking motion, and its face will be preserved absolutely parallel to that of the bed. Thcblock is furthermore guided by the lugs 7 and 8, arranged at the back of the guide-plate, extending above and below the edge of the table. This relieves the stud of excessive strain during the direct sliding motion. Upon the backward movement of the arm 4 the stud and straight portion of the slot will guide the block so that it will slide without rocking until the curved portion of the slot reaches the stud, when the sliding movement of the block will be retarded, and it will be caused to both rock and slide differentially upon its curved face, the sliding motion ceasing entirely as soon as the point 13 passes beyond the stud. The block will then rock upon the curved face until the end of the slot reaches the stud, the latter in connection with the slot preventing any departure from a true rolling motion, and therefore locking the block so that it cannot be slid upon the table. The slot and stud act in like manner'when the motion of the arm 4 is reversed, the block first rocking until its face is nearly vertical, and then differentially sliding and rolling into the forward sliding action without further rocking motion, as before.

In connection with the above described movements, the arc portion of the curve :0 performs an important function in gradually changing the motion from a rocking to a sliding motion, and vice versa, thereby preventing the evils that would result from an abrupt change of motion. As the intermediate section of the slot passes the engagement of the stud to the straight portion of the slot with a constantly-decreasing velocity, owing to the form ofthis portion of the slot, the consequence is, that the lug 8 and flattened portion 10 are brought into contact with the table very gradually, avoiding all shocks and jars. 111 this manner the movement of a mass which may weigh hundreds of pounds is produced with practically no friction during the chief-the rolling-portion of the motion,while the said rolling motion is converted into a reciprocating sliding motion without noise, shock, or material wear of the parts, and vice versa. The rocking block is also positively locked against displacement in every position which it may occupy, so that it cannot slide during the time when it should rock, or rock during the time when it should slide.

It is evident that a plurality of rockerblocks, tables, and guide-plates may be used together, and that two or more guide-plates may be used in connection with a single rockerblock. For instance, there may be two guideplates upon opposite sides of the block and two guide-studs at opposite edges of the table. This arrangement also admits of the blockbeing rolled properly on a table set to an angle from the horizontal.

Without limiting myself to the precise construction and arrangement of parts shown, I claim I 1. The within described improvement in controlling a rocking and sliding motion, the same consisting in combining, with a block having a curved face resting upon a table and a guide-plate connected to the block, a slot having curved and straight portions, and a guide-stud extending into said slot, substantially as set forth.

2. The combination of a table, a block having a curved face resting on said table, a reciprocating arm jointed to said block, a plate connected to said block and having a slot partially curved and partially straight, and a stud projecting from the table into said slot, all substantially as set forth.

3. The combination of a table and a stationary plate or bed, a block provided with a curved face and supported by said table, a plate having a slot partly curved and partly straight and connected to said block, and a stud extending to the slot in said plate, substantially as set forth.

4. The combination, with the table and rocking block and stationary guide-stud, of a plate connected to the block and provided with a slot and with lugs, arranged substantially as set forth.

5. The combination, with the table and sliding and rocking block, of a stationary stud and plate connected to the block and provided with a slot receiving said stud, formed to insure the true rolling action of the block upon the plate, and also formed to gradually convert the rolling into a sliding motion, or

vice versa, substantially as set forth.

6. The combination,with the table and stationary stud and reciprocating arm, of ablock journaled to said arm, and provided with a curved face merging into a fiat face, and a guide-plate connected to the block and provided with a slot receiving said stud, substantially as set forth. g

7. The sliding and rocking block provided with a plate having a slot, one portion of which coincides with a cycloidal curve, the other portion straight, and the two connected byv a portion coinciding with the arc of a circle, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN THoMsoN.

W'itnesses:

J AS. G. COOPER, J os. H. PATTERSON. 

